Automatic air-feed and rotation-motor control for rock drills



w, 30,1923. nmmw L. C. BAYLES AUTOMATIC AIR FEED AND ROTATION MOTOR CONTROL FOR ROCK DRILLS Filed Nov. 12, 1921' W5 ATTOZR Patented @et. 30, 1923.

UNHTE STATES t me Tsar car ies.

LEWIS C. BAYLES, OF EASTON, 'PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, 011" JERSEY CITY, NEW JERSE YfA CORPORATION OF NEW JERSEY.

AUTOMATIC AIR-FEED AND ROTATION-MOTOR CONTROL FOR, ROCK DBILLS.

Application filed November 12, 1921 Serial No. 514,648.

To all whom it may concern Be it known that I, Lnwis C. BAYLES, a citizen of the United States, and a resident of Easton, county of Northampton, and State of Pennsylvania, have invented a cer tain Automatic Air-Feed and Rotation- Motor Control for Rock Drills, of which the following is a specification accompanied by drawings. v

This invention relates to fluid pressure rock drills of the hammer type, but more particularly to means for controlling the feeding element and the rotation element of a stope drill.

In my co -pending application, Serial No.

408,299 filed September 4: 1920, I have disclosed a hand operated valve for increasing the rotation and reducing the. power of the fluid pressure feed, by supplying fluid pressure from the feeding elementto the rotation motor. vention is to automatically increase the rotation and reduce the power of the feed by permitting the passage of motive fluid from the feeding element into the rotation;

motor. For illustrative purposes, I have chosen to show a form of automatic device controlled by the resistance to rotation or torque of the motor, although I do-not confine myself to any particular automatic de vice except as defined by the claims appended hereto.

My invention is illustrated in the acciom} panying drawings, in which I Figure 1 is a side elevation partly in vertical section of a rock drill embodying the invention, v V

Figure 2 is a detail transverse'sectional view taken on the line 2--2 of Figure 1 looking inthe direction of the arrows,

Figure 3 is a transverse sectional view on the line 33 of F igure 1, and

Figure 4 is a detail transvers'e sectional View in diagrammatic form taken through therotation motor on the line 4: 4: of Figure 1. I

Referring to the draw1ngs,a stope'drill is illustrated in the figures, having the cylinder A and front head B provided with the rotation sleeve C through which the drill steel D extends in position .to receive the impact blows of the hammer An independent fluid actuated rotation motor is provided for rotating the drill steel, having the gears I*, only one of which is shown The object of the present in the motor, is operatively connected through a suitable shaft 0 and pinion P, meshing with the gear Q on the rotation sleeve C, for rotating the drillsteel. -A sleeve H is preferably located between the feed cylinderH and the head block G and a stem or rod R, having a head J within the head block G, slidably but ,non-rotatably, engages the piston J as by means of a rib H in the piston and a longitudinal groove K in the stem or rod R. In accordance with this constructio-m'the head block G and portions of the machine carried thereby, may rotate relatively to the head J so that an automatic valve. L, to be described, may bev mounted withinthe head block G and actuated bythe. torque of the rotation motor, which variesfin accordance with resistance to rotation of the drill steel.

Fluid pressure, as, live air, is supplied to the machine atv the inlet S and passes throughthe admission port T to the percussive element, controlled by the throttle T, having the handle T and also through the small port 1 to the. feed cylinder H, around thevreduced neck r of the valve L. Fluid also passes to the rotation motor through the valve chamber V and admission port W, controlled in this instance by the automatic regulating valve U, covered ,by United States Patent No. 1,414,168 granted April 1922, to Fred M. Slater and myself.- This valve U need not be further described, than to say that it is provided with a tapered head X which controls the admission of fluid pressure to the motor and an increased back pressure from the motort-hrough the port You the plunger head Z, assisted by the light spring a, tends to openthe valve wider and admit more pressure to the motor as needed. A corresponding reduction of pressure on the plunger head Z permits the tape'red head. Xf of the valve to move inward against the light spring pressure and needed.

reduce the supply to motor as required. The machine is provided with the usual manually operated rotation handle I) suitably secured to a portion of the casing as for instance, the head block G.

The head block G is conveniently provided with a valve casing'c within which the valve L" extends and moves longitudinally. A spring d held in position by the cap 6, having the vent f, normally'urges the valve L inwardly and maintains the passage 9 leading from the valve casing to the valve chamber'of' the valve U, closed, so that the passa e of motive fluid from the feed cylinder IT around the reduced portion 1" of the valve L and thence through the passage g and the passage Y to the motor, is normally cut off. The inner head h of the valve L bears against a shoulder j on the-'non-rotatable head J "Within the head block Gr,- sothat upon a suificient increase of resistance to rotation of the drill steel to compress the spring d, the head block G and drill casing and connected parts will be rotated backwardly or counter-clockwise as Figure 2 is viewed,'thus moving the valve L longitudinally ineits casing and permitting the passage of motive fluid from the feed cylinder H into the'rotation motor for increasing the power of rotation when most The action is automatic and independent of the'manipulation of the operator.

1 The port WV leading to the motor is so re stricted that'it cannot pass enough air to cause the motor to run away even when the motor is unloaded, therefore in view of the unavoidable leakage existing in this class of motors, theport W will not pass enough air to build up a high pressure in passage Y and produce high rotating torque in the motor'even when the valve U is fully open.

For this reason the pressure in the passage Y is always lower than the pressure in the air feed and when the communication is opened the air will always flow from the air.

feed through the passage g to the passage Y.

In addition, the passage 1" is made of restricted area, so that while it is suflicient to maintain pressure in the air feed under normal working conditions, 1t will not mamtam' this pressure when air is being drawn down to the motor through the passage 9 and at such times the pressure in the air feed will be reduced, and some air will pass out of the air feed to the motor.

I claim; 7 1. A rock drill ofthe hammer type, hav ing a fluid actuated rotation motor and a fluid pressure feeding element, and automatic controlling means for increasing the rotation by opening communication for fluid tation motor.

2. A rock drill of the hammer type, having a fluid actuated rotation motor and a vpressure from the feeding element to" the rofluid pressure feeding element, and automatic controlling means for permitting the passage of motive fluid from the'feedi'ngelement into the rotation motor, to thereby increase the rotation. 7

3. A rock drill of the hammer type, having a fluid actuated rotation motor and a fluid pressure feedingelement, and automatic controlling means for increasing the rotation and reducing the power of the fluid pressure, feed, by opening communlcation for fluid pressure from the feeding element to the rotation motor.

4. A rock drill of the hammer type, having a fluid actuated rotation motor and a fluid pressure feeding element, and automatic controlling means for increasing the 6. A rock drill of the hammer type, hav

ing a fluid actuated rotation motor and a fluid pressure feeding'element, and auto matic controlling means for reducing the power of the fluid pressure feed, including means 'for simultaneou'sly increasing the rotation by exhausting the feeding means into the rotation motor. 7 v

7. A rockdrill of the hammer type, having a fluid actuated rotation motor and a fluid pressure feeding element, and automatic controlling means for reducing the power of the fluid pressure feed, and increasing the rotation, by connecting the feeding element to the intake of the rotation motor. 4

8. A rock drill of the hammer type, having a fluid actuated rotation motor and a fluid pressure feeding element, and auto matic means controlled by the resistance to rotation for o eningcommunication for fluid pressure rom the feeding element to the rotation motor for increasing the rotation. I

9. A rock drill of the hammer type, having a fluid actuated rotation motor and a.

fluid pressure feeding element, and automatic means controlled by the resistance to rotation for permitting the passage of motive fluid from the feeding element into the rotation motor, to thereby increase the ro' tation. a

10, A rock drill of the hammer type, having a fluid actuated rotation motor and a fluid pressure feeding element, and automatic means controlled by the torque of the motor for opening communication for fluid pressure from the feeding element to the r0- tation motor for increasing the rotation.

11. A rock drill of the hammer type, having a fluid actuated rotation motor and a 5 fluid pressure feeding element, and automatic means controlled by the torque of the motor for permitting the passage of motive fluid from the feeding element into the rotation motor, to thereby increase the rotation.

In testimony whereof I have signed this specification. v

LEWIS C. BAYLES. 

